سَأَلْتُ أَبَا جَعْفَرٍ ع عَنْ رَجُلٍ كَانَتْ لَهُ أُمٌّ مَمْلُوكَةٌ فَلَمَّا حَضَرَتْهُ الْوَفَاةُ انْطَلَقَ رَجُلٌ مِنْ أَصْحَابِنَا فَاشْتَرَى أُمَّهُ وَ اشْتَرَطَ عَلَيْهَا أَنِّي أَشْتَرِيكِ وَ أُعْتِقُكِ فَإِذَا مَاتَ ابْنُكِ فُلَانُ بْنُ فُلَانٍ فَوَرِثْتِهِ أَعْطِينِي نِصْفَ مَا تَرِثِينَ عَلَى أَنْ تُعْطِينِي بِذَلِكِ عَهْدَ اللَّهِ وَ عَهْدَ رَسُولِهِ فَرَضِيَتْ بِذَلِكَ فَأَعْطَتْهُ عَهْدَ اللَّهِ وَ عَهْد
“I once asked abu Ja‘far (a.s.), about the case of a man who had a mother who was owned by someone. When it was the time of his death a certain person of our people went and bought his mother. He set the condition that he buys her and sets her free; if after the death of her son so and so, son of so and so, when she wi